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LT3508IUF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LT3508
25
3508fd
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
D 8/11 Revised Typical Application drawing TA01a
Changed R
T
/SYNC pin name to RT/SYNC
Updated Pin Confi guration drawings
Revised Exposed Pad, V
C1
, V
C2
and V
IN1
pin descriptions in Pin Functions section
Made minor text edits in Operation and Applications Information sections
Updated equations in Input Capacitor and Shutdown and Undervoltage Lockout sections and revised Figure 4 of
Applications Information
Moved last paragraph of Multiple Inputs section to the Soft-Start section in Applications Information
1
1, 2, 6, 7, 8,
10, 17, 20, 21,
22, 26
2
6
8, 10
11, 13, 15
17
(Revision history begins at Rev D)
LT3508
26
3508fd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2007
LT 0811 REV D • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
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: 3V to 25V, V
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Q
= 1mA, S8, TSSOP16E Packages
LT1766 60V, 1.2A (I
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V
IN
: 5.5V to 60V, V
OUT(MIN)
= 1.2V, I
Q
= 2.5mA, TSSOP16/TSSOP16E
Packages
LT1767 25V, 1.2A (I
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V
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= 1mA, MS8, MS8E Packages
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V
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= 1.25V, I
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= 3.8mA, TSSOP16E Packages
LTC3407 Dual 600mA, 1.5MHz, Synchronous Step-Down
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V
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: 2.5V to 5.5V, V
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Q
= 40µA, MSE Package
LT3493 1.2A, 750kHz Step-Down Switching Regulator in
2mm × 3mm DFN
V
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: 3.6V to 36V, V
OUT(MIN)
= 0.78V, I
Q
= 1.9mA, 2mm × 3mm DFN Package
LT3501/LT3510 Dual 3A/2A, 1.5MHz High Effi ciency Step-Down
Switching Regulators
V
IN
: 3.6V to 25V, V
OUT(MIN)
= 0.8V, I
Q
= 3.7mA, I
SD
< 10µA,
TSSOP20E Package
LT3506/LT3506A Dual Monolithic 1.6A, 1.1MHz Step-Down Switching
Regulators
V
IN
: 3.6V to 25V, V
OUT(MIN)
= 0.8V, I
Q
= 3.8mA, 16-Lead DFN and 16-Lead
TSSOPE Packages
LTC3701 Two Phase, Dual, 500kHz, Constant Frequency, Current
Mode, High Effi ciency Step-Down DC/DC Controller
V
IN
: 2.5V to 10V, V
OUT(MIN)
= 0.8V, I
Q
= 460µA, SSOP-16 Package
LTC3736 Dual Two Phase, No R
SENSE
™, Synchronous Controller
with Output Tracking
V
IN
: 2.75V to 9.8V, V
OUT(MIN)
= 0.6V, I
Q
= 300µA, 4mm × 4mm QFN or
SSOP-24 Packages
LTC3737 Dual Two Phase, No R
SENSE
DC/DC Controller with
Output Tracking
V
IN
: 2.75V to 9.8V, V
OUT(MIN)
= 0.6V, I
Q
= 220µA, 4mm × 4mm QFN or
SSOP-24 Packages
TYPICAL APPLICATION
5V, 1.8V Output from PCI Express
V
IN
12V
BOOST2
LT3508
V
IN1
V
IN2
GND
3508 TA05
RT/SYNC
C7
330pF
C5
47µF
C6
10µF
C1
4.7µF
C3
0.1µF
R9
40.2k
R10
14.7k
C4
0.1µF
R6
47k
C9
100pF
R5
43k
R4
15.0k
R8
33.2k
C1 TO C6: X5R OR X7R
D1, D2: MMSD4148
D3: DIODES INC. B140
D4: DIODES INC. B120
f
SW
= 1MHz
R1
52.3k
R7
100k
R2
18.7k
R3
10k
L2
3.3µH
L1 6.8µH
D1
D2
V
IN2
3.3V
D3 D4
POWER
GOOD
OUT2
1.8V
1.4A
OUT1
5V
0.9A
C2
4.7µF
C8
0.047µF
C10
0.047µF
BOOST1
SHDN
SW2
SW1
FB2FB1
V
C2
PG1
V
C1
TRACK/SS1
PG2TRACK/SS2
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

LT3508IUF#PBF

Mfr. #:
Buy LT3508IUF#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual Monolithic 1.4A Step-Down Switching Regulator
Lifecycle:
New from this manufacturer.
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